Question1) $\cos \theta \times \tan \theta=\sin \theta$

Studdy Solution
Since the equation simplifies to an identity, $\theta$ can be any angle where $\tan \theta$ and $\cos \theta$ are defined. Specifically, $\theta$ cannot be values where $\cos \theta = 0$ because $\tan \theta$ would be undefined. These are values like $\theta = \frac{\pi}{2} + n\pi$, where $n$ is an integer.
The solution is that $\theta$ can be any angle except where $\cos \theta = 0$.